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141 lines
6.4 KiB
141 lines
6.4 KiB
/* |
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* AAC encoder intensity stereo |
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* Copyright (C) 2015 Rostislav Pehlivanov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* AAC encoder Intensity Stereo |
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* @author Rostislav Pehlivanov ( atomnuker gmail com ) |
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*/ |
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#include "aacenc.h" |
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#include "aacenc_utils.h" |
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#include "aacenc_is.h" |
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#include "aacenc_quantization.h" |
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struct AACISError ff_aac_is_encoding_err(AACEncContext *s, ChannelElement *cpe, |
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int start, int w, int g, float ener0, |
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float ener1, float ener01, |
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int use_pcoeffs, int phase) |
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{ |
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int i, w2; |
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SingleChannelElement *sce0 = &cpe->ch[0]; |
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SingleChannelElement *sce1 = &cpe->ch[1]; |
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float *L = use_pcoeffs ? sce0->pcoeffs : sce0->coeffs; |
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float *R = use_pcoeffs ? sce1->pcoeffs : sce1->coeffs; |
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float *L34 = &s->scoefs[256*0], *R34 = &s->scoefs[256*1]; |
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float *IS = &s->scoefs[256*2], *I34 = &s->scoefs[256*3]; |
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float dist1 = 0.0f, dist2 = 0.0f; |
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struct AACISError is_error = {0}; |
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for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) { |
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FFPsyBand *band0 = &s->psy.ch[s->cur_channel+0].psy_bands[(w+w2)*16+g]; |
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FFPsyBand *band1 = &s->psy.ch[s->cur_channel+1].psy_bands[(w+w2)*16+g]; |
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int is_band_type, is_sf_idx = FFMAX(1, sce0->sf_idx[(w+w2)*16+g]-4); |
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float e01_34 = phase*pow(ener1/ener0, 3.0/4.0); |
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float maxval, dist_spec_err = 0.0f; |
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float minthr = FFMIN(band0->threshold, band1->threshold); |
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for (i = 0; i < sce0->ics.swb_sizes[g]; i++) |
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IS[i] = (L[start+(w+w2)*128+i] + phase*R[start+(w+w2)*128+i])*sqrt(ener0/ener01); |
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abs_pow34_v(L34, &L[start+(w+w2)*128], sce0->ics.swb_sizes[g]); |
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abs_pow34_v(R34, &R[start+(w+w2)*128], sce0->ics.swb_sizes[g]); |
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abs_pow34_v(I34, IS, sce0->ics.swb_sizes[g]); |
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maxval = find_max_val(1, sce0->ics.swb_sizes[g], I34); |
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is_band_type = find_min_book(maxval, is_sf_idx); |
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dist1 += quantize_band_cost(s, &L[start + (w+w2)*128], L34, |
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sce0->ics.swb_sizes[g], |
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sce0->sf_idx[(w+w2)*16+g], |
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sce0->band_type[(w+w2)*16+g], |
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s->lambda / band0->threshold, INFINITY, NULL, 0); |
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dist1 += quantize_band_cost(s, &R[start + (w+w2)*128], R34, |
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sce1->ics.swb_sizes[g], |
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sce1->sf_idx[(w+w2)*16+g], |
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sce1->band_type[(w+w2)*16+g], |
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s->lambda / band1->threshold, INFINITY, NULL, 0); |
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dist2 += quantize_band_cost(s, IS, I34, sce0->ics.swb_sizes[g], |
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is_sf_idx, is_band_type, |
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s->lambda / minthr, INFINITY, NULL, 0); |
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for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { |
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dist_spec_err += (L34[i] - I34[i])*(L34[i] - I34[i]); |
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dist_spec_err += (R34[i] - I34[i]*e01_34)*(R34[i] - I34[i]*e01_34); |
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} |
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dist_spec_err *= s->lambda / minthr; |
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dist2 += dist_spec_err; |
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} |
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is_error.pass = dist2 <= dist1; |
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is_error.phase = phase; |
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is_error.error = fabsf(dist1 - dist2); |
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is_error.dist1 = dist1; |
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is_error.dist2 = dist2; |
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return is_error; |
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} |
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void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe) |
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{ |
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SingleChannelElement *sce0 = &cpe->ch[0]; |
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SingleChannelElement *sce1 = &cpe->ch[1]; |
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int start = 0, count = 0, w, w2, g, i; |
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const float freq_mult = avctx->sample_rate/(1024.0f/sce0->ics.num_windows)/2.0f; |
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if (!cpe->common_window) |
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return; |
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for (w = 0; w < sce0->ics.num_windows; w += sce0->ics.group_len[w]) { |
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start = 0; |
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for (g = 0; g < sce0->ics.num_swb; g++) { |
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if (start*freq_mult > INT_STEREO_LOW_LIMIT*(s->lambda/170.0f) && |
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cpe->ch[0].band_type[w*16+g] != NOISE_BT && !cpe->ch[0].zeroes[w*16+g] && |
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cpe->ch[1].band_type[w*16+g] != NOISE_BT && !cpe->ch[1].zeroes[w*16+g]) { |
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float ener0 = 0.0f, ener1 = 0.0f, ener01 = 0.0f; |
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struct AACISError ph_err1, ph_err2, *erf; |
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if (sce0->band_type[w*16+g] == NOISE_BT || |
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sce1->band_type[w*16+g] == NOISE_BT) { |
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start += sce0->ics.swb_sizes[g]; |
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continue; |
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} |
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for (w2 = 0; w2 < sce0->ics.group_len[w]; w2++) { |
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for (i = 0; i < sce0->ics.swb_sizes[g]; i++) { |
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float coef0 = fabsf(sce0->pcoeffs[start+(w+w2)*128+i]); |
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float coef1 = fabsf(sce1->pcoeffs[start+(w+w2)*128+i]); |
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ener0 += coef0*coef0; |
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ener1 += coef1*coef1; |
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ener01 += (coef0 + coef1)*(coef0 + coef1); |
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} |
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} |
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ph_err1 = ff_aac_is_encoding_err(s, cpe, start, w, g, |
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ener0, ener1, ener01, 0, -1); |
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ph_err2 = ff_aac_is_encoding_err(s, cpe, start, w, g, |
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ener0, ener1, ener01, 0, +1); |
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erf = ph_err1.error < ph_err2.error ? &ph_err1 : &ph_err2; |
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if (erf->pass) { |
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cpe->is_mask[w*16+g] = 1; |
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cpe->ch[0].is_ener[w*16+g] = sqrt(ener0/ener01); |
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cpe->ch[1].is_ener[w*16+g] = ener0/ener1; |
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cpe->ch[1].band_type[w*16+g] = erf->phase ? INTENSITY_BT : INTENSITY_BT2; |
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count++; |
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} |
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} |
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start += sce0->ics.swb_sizes[g]; |
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} |
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} |
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cpe->is_mode = !!count; |
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}
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